Help with picking the best toy for pegging

Hey all, this is my first ever post on reddit even though I'm a frequent reader and was hoping I could get some help from you wonderful people.

I've been dating my wonderful boyfriend for 2 years now but unfortunately before we met he was in an accident that left him with some lower spinal damage, as a result he's unable to feel any sensation in his genitals or gain an erection. He was very forthcoming with this fact before we started dating and as a result our sex life largely consisted of him giving me oral and using various toys on me, he's always been very content to just give me pleasure but I've always had somewhat of guilty feeling in our relationship for it being so one-sided.

Recently however I've talked him into exploring alternate paths for pleasure and we've been having a great time doing so, one of the best things that's working for us is prostate massage and as such we've decided to explore pegging, we have a great time doing it currently but we feel the toy isn't quite as perfect as it could be, which is why I though we could perhaps get some advice from those of you who are frequent peggers.

Some specifications that we're looking for;

Something able to provide the most sensation, so that would probably translate to it being heavily ridged. Able to be received by a strap-on harness (although our harness is quite fancy and can be adjusted to pretty much take anything). Size isn't much of an issue but we've only been at it for a couple of months so nothing monstrous please. As a bonus, a suction cup base would also be good as to make our playtime more versatile i.e. we could stick it to the wall.

If any of you have a specific toy that you think would be suitable that would be great but generally any discussion on ways to improve things, or activities to try would also be welcome.

Thanks very much in advanced and feel free to ask anything (as long as its in a polite way of course).